Revelation 14:15 References

15 And another angel acame out of the temple, crying out with a loud voice to Him who sat on the cloud, "bPut in your sickle and reap, for the hour to reap has come, because the charvest of the earth is ripe."

b Joel 3:13, Mark 4:29, Revelation 14:18

Joel 3

13 aPut in the sickle, for the bharvest is ripe. Come, ctread, for the dwine press is full; The vats overflow, for their ewickedness is great.

Mark 4

29 "But when the crop permits, he immediately aputs in the sickle, because the harvest has come."

Revelation 14

18 Then another angel, athe one who has power over fire, came out from bthe altar; and he called with a loud voice to him who had the sharp sickle, saying, "cPut in your sharp sickle and gather the clusters from the vine of the earth, dbecause her grapes are ripe."

Other references for Revelation 14:15

a Revelation 11:19, Revelation 14:17, Revelation 15:6, Revelation 16:17
c Jeremiah 51:33, Matthew 13:39-41